大家好！我想尝试一下LM4F232和MSP430g2553之间的I2C通信。M4不断发送数据给430，以下是我的代码：
（1）M4 做主机（代码是修改ivaWare\examples\peripherals\i2c的）
#define SLAVE_ADDRESS 0x48
int
main(void)
{
SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0); //I2C0 enablePB[3:2]
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
GPIOPinConfigure(GPIO_PB2_I2C0SCL);
GPIOPinConfigure(GPIO_PB3_I2C0SDA);
GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_2 | GPIO_PIN_3);
HWREG(I2C0_MASTER_BASE + I2C_O_MCR) |= 0x01;
I2CMasterInitExpClk(I2C0_MASTER_BASE, SysCtlClockGet(), false); // Initialize the I2C0 master module. I2C data transfer rate.
I2CSlaveEnable(I2C0_SLAVE_BASE); // Set the slave address to SLAVE_ADDRESS.
I2CSlaveInit(I2C0_SLAVE_BASE, SLAVE_ADDRESS);
I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, false);
while(1)
{
I2CMasterDataPut(I2C0_MASTER_BASE, 0x55);
I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_SINGLE_SEND);
while(!(I2CSlaveStatus(I2C0_SLAVE_BASE) & I2C_SCSR_RREQ))
{
}
}
}
（2）MSP430的代码
#include"msp430g2553.h"
unsignedcharRXData;
voidmain(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P1DIR |= BIT0; // P1.0 output
P1SEL |= BIT6 + BIT7; // Assign I2C pins to USCI_B0
P1SEL2|= BIT6 + BIT7; // Assign I2C pins to USCI_B0
UCB0CTL1 |= UCSWRST; // Enable SW reset
UCB0CTL0 = UCMODE_3 + UCSYNC; // I2C Slave, synchronous mode
UCB0I2COA = 0x48; // Own Address is 048h
UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation
UCB0I2CIE |= UCSTTIE; // Enable STT interrupt
IE2 |= UCB0TXIE; // Enable TX interrupt
// TXData = 0xff; // Used to hold TX data
while (1)
{
__bis_SR_register(CPUOFF + GIE); // Enter LPM0 w/ interrupts
}
}
// USCI_B0 State ISR
#pragma vector = USCIAB0TX_VECTOR
__interruptvoidUSCIAB0RX_ISR(void)
{
RXData = UCB0RXBUF; // Get RX data
__bic_SR_register_on_exit(CPUOFF); // Exit LPM0
}
现在我的情况是SCL和SDA没有波形，全部为低电平（我已将上拉电阻焊上了），我不知道哪里的问题，通信没有成功。请大家帮忙看看！
